Theo Coumbis

The team must stop a vengeful bomber; Danny's fun-loving brother (Dane Cook) visits unexpectedly.

Locke must enlist the help of an unlikely ally when the hatch takes on a life of its own.

Steve and Catherine are still reeling from the murder of one of their ohana and, along with Danny, Junior and some old friends, Harry Langford and Wade Gutches, hunt down the killer. Also, Tani and Grover investigate when a bag of human bones, discovered inside an abandoned storage locker, goes missing.